2026-10-14T08:27:46Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33940576 2026-09-18T18:12:14Z category_1 category_146 category_7 category_272 category_873 category_39 category_46 category_734 portal_63 item_type_3 month_year_09_2026

Unlocking Water as Docking Sites in Covalent Organic Frameworks for Enhanced Physisorptive Carbon Capture under Wet Conditions He Li (176971) Xiansong Shi (1442545) Wei Zhao (14321) Chunqing Ji (9423565) Lisa Saunders Baugh (1365612) Yogesh V. Joshi (2370715) Saifudin Abubakar (16031318) Dan Zhao (285025) Biophysics Space Science Medicine Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Ecology Immunology Biological Sciences not elsewhere classified still rarely reported incorporating strong nucleophiles enhanced carbon capture drifts ), solid covalent organic frameworks additional sorption site effective docking sites distinctive adsorption mechanism 2 </ sub 1 </ sup physisorptive mecc capable docking sites situ </ sorption simulation physisorptive systems wide range wet conditions water molecules water around uptake capacity unlocking water thereby converting substantial enhancement relative humidity porous materials forming bicarbonate dry conditions crucial role converting water amphiphilic pores adsorption within The physisorptive CO₂ capture process frequently faces the challenge of competing with moisture adsorption. Incorporating strong nucleophiles into porous materials can circumvent this issue by forming bicarbonate in the presence of moisture. However, the moisture-enhanced carbon capture (MECC) in physisorptive systems is still rarely reported. Herein, we present a physisorptive MECC capable of operating at a wide range of relative humidity (RH), employing newly developed covalent organic frameworks (COFs) with Brønsted-acidic squaramide as linkage. Specifically, the squaramide linkage and a specific pore size jointly disrupt hydrogen bonds (HBs) in water molecules, thereby converting them into effective docking sites for CO₂ adsorption within the amphiphilic pores. Comprehensive column breakthrough experiments highlight a substantial enhancement in CO₂ uptake capacity in the squaramide-linked COFs in the presence of moisture (up to 75% RH) compared to dry conditions. The distinctive adsorption mechanism is further interpreted through <i>in situ</i> diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), solid-state ¹H magic angle spinning nuclear magnetic resonance (ss ¹H MAS NMR), dielectric analysis, and sorption simulation, demonstrating that the water around the squaramide linkage could play a crucial role in enhancing CO₂ adsorption in the presence of moisture. This work provides new insight into converting water as an additional sorption site and a strategy for addressing the influence of moisture in physisorptive carbon capture processes. 2026-09-18T00:00:00Z Dataset Dataset 10.1021/jacs.6c11850.s003 https://figshare.com/articles/dataset/Unlocking_Water_as_Docking_Sites_in_Covalent_Organic_Frameworks_for_Enhanced_Physisorptive_Carbon_Capture_under_Wet_Conditions/33940576 CC BY-NC 4.0